package com.maomao.ssoserver.controller;

import java.net.URI;
import java.net.URISyntaxException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.oltu.oauth2.as.issuer.MD5Generator;
import org.apache.oltu.oauth2.as.issuer.OAuthIssuerImpl;
import org.apache.oltu.oauth2.as.request.OAuthAuthzRequest;
import org.apache.oltu.oauth2.as.response.OAuthASResponse;
import org.apache.oltu.oauth2.common.OAuth;
import org.apache.oltu.oauth2.common.error.OAuthError;
import org.apache.oltu.oauth2.common.exception.OAuthProblemException;
import org.apache.oltu.oauth2.common.exception.OAuthSystemException;
import org.apache.oltu.oauth2.common.message.OAuthResponse;
import org.apache.oltu.oauth2.common.message.types.ResponseType;
import org.apache.oltu.oauth2.common.utils.OAuthUtils;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.subject.Subject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.RequestMapping;

import com.maomao.ssoserver.Constants;
import com.maomao.ssoserver.model.BaseUser;
import com.maomao.ssoserver.service.OAuthService;
import com.maomao.ssoserver.service.OauthClientService;

@Controller
public class AuthorizeController {
	@Autowired  
	private OAuthService oAuthService;  
	@Autowired  
	private OauthClientService clientService; 
	
	@SuppressWarnings({ "unchecked", "rawtypes" })
	@RequestMapping("/oauth/authorize")
	public Object authorize(Model model, HttpServletRequest request) throws URISyntaxException,OAuthSystemException{
		
		 try {  
		      //构建OAuth 授权请求  
		      OAuthAuthzRequest oauthRequest = new OAuthAuthzRequest(request);  
		      //检查传入的客户端id是否正确  
		      if (!oAuthService.checkClientIdAuth(oauthRequest.getClientId())) {  
		        OAuthResponse response = OAuthASResponse  
		             .errorResponse(HttpServletResponse.SC_BAD_REQUEST)  
		             .setError(OAuthError.TokenResponse.INVALID_CLIENT)  
		             .setErrorDescription(Constants.INVALID_CLIENT_DESCRIPTION)  
		             .buildJSONMessage();  
		        return new ResponseEntity(  
		           response.getBody(), HttpStatus.valueOf(response.getResponseStatus()));  
		      }  
		  
		      Subject subject = SecurityUtils.getSubject();  
		      //如果用户没有登录，跳转到登陆页面  
		      if(!subject.isAuthenticated()) {  
		        if(!login(subject, request)) {//登录失败时跳转到登陆页面  
		        	  model.addAttribute("client",      
		              clientService.findByClientId(oauthRequest.getClientId()));  
		        	  return "login";  
		        }  
		      }  
		  
		     // BaseUser user = (BaseUser)subject.getPrincipal();
		      String username = (String)subject.getPrincipal();  
		      //生成授权码  
		      String authorizationCode = null;  
		      //responseType目前仅支持CODE，另外还有TOKEN  
		      String responseType = oauthRequest.getParam(OAuth.OAUTH_RESPONSE_TYPE);  
		      if (responseType.equals(ResponseType.CODE.toString())) {  
		        OAuthIssuerImpl oauthIssuerImpl = new OAuthIssuerImpl(new MD5Generator());  
		        authorizationCode = oauthIssuerImpl.authorizationCode();  
		        oAuthService.addAuthCode(authorizationCode, username);  
		      }  
		      //进行OAuth响应构建  
		      OAuthASResponse.OAuthAuthorizationResponseBuilder builder =  
		        OAuthASResponse.authorizationResponse(request,   
		                                           HttpServletResponse.SC_FOUND);  
		      //设置授权码  
		      builder.setCode(authorizationCode);  
		      //得到到客户端重定向地址  
		      String redirectURI = oauthRequest.getParam(OAuth.OAUTH_REDIRECT_URI);  
		  
		      //构建响应  
		      final OAuthResponse response = builder.location(redirectURI).buildQueryMessage();  
		      //根据OAuthResponse返回ResponseEntity响应  
		      HttpHeaders headers = new HttpHeaders();  
		      headers.setLocation(new URI(response.getLocationUri()));  
		      return new ResponseEntity(headers, HttpStatus.valueOf(response.getResponseStatus()));  
		    } catch (OAuthProblemException e) {  
		      //出错处理  
		      String redirectUri = e.getRedirectUri();  
		      if (OAuthUtils.isEmpty(redirectUri)) {  
		        //告诉客户端没有传入redirectUri直接报错  
		        return new ResponseEntity(  
		          "OAuth callback url needs to be provided by client!!!", HttpStatus.NOT_FOUND);  
		      }  
		      //返回错误消息（如?error=）  
		      final OAuthResponse response =  
		              OAuthASResponse.errorResponse(HttpServletResponse.SC_FOUND)  
		                      .error(e).location(redirectUri).buildQueryMessage();  
		      HttpHeaders headers = new HttpHeaders();  
		      headers.setLocation(new URI(response.getLocationUri()));  
		      return new ResponseEntity(headers, HttpStatus.valueOf(response.getResponseStatus()));  
		    }
	}
	
	private boolean login(Subject subject, HttpServletRequest request) {
        if("get".equalsIgnoreCase(request.getMethod())) {
            return false;
        }
        String username = request.getParameter("username");
        String password = request.getParameter("password");

        if(StringUtils.isEmpty(username) || StringUtils.isEmpty(password)) {
            return false;
        }

        UsernamePasswordToken token = new UsernamePasswordToken(username, password);

        try {
            subject.login(token);
            return true;
        } catch (Exception e) {
            request.setAttribute("error", "登录失败:" + e.getClass().getName());
            return false;
        }
    }

}
